I've found that Lee moulds leave a less pronounced sprue than Lyman, but all cast balls will have a sprue. I've also found that positioning of the sprue when loading doesn't have a very dramatic effect on accuracy. Put fifty or so in a rotary tumbler for 20-30 minutes and the remains of the sprue will be virtually undetectable. Of course, they look like miniature lead golf balls when you're done, but, once again, I don't see any adverse effect on accuracy.

If you can't live with the sprue get yourself a cast iron skillet or dutch oven. Put enough balls in to cover no more than half the bottom. Place in the bed of your truck or your trunk and drive around for a week or so. The sprue should be gone or greatly reduced. If the sprue is not gone to your liking, cut more of it off with side cutters before putting in the pan. For match shooting or where accuracy counts, weigh the balls before using.

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